Consider statements about plant biology: 1. Xylem vessels are dead at maturity. 2. Phloem sieve tubes are living at maturity. 3. Cambium is responsible for primary growth. Which are correct? MCQ with Answer and Explanation

Xylem vessels and tracheids are dead, hollow cells at functional maturity, providing a continuous tube for water transport. Phloem sieve tube elements are living cells at maturity, though they lack a nucleus, and are responsible for transporting organic nutrients. Cambium (vascular and cork) is a lateral meristem responsible for secondary growth (increase in girth), while apical meristems are responsible for primary growth (increase in length). Thus, statements 1 and 2 are correct.